331
FNCA52 TJSJ 231930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST SUN AUG 23 2026
DISCUSSION
DURING THE MORNING HOURS, MOISTURE CONTENT IS ASSOCIATED WITH A
TROPICAL WAVE APPROACHING THE REGION. RAWS/AWOS STATIONS ACROSS
THE SOUTHERN COASTAL PLAINS OF PUERTO RICO AND ST. CROIX IN THE
U.S. VIRGIN ISLANDS REPORTED WINDS BETWEEN 20 - 23 MPH, WITH
GUSTS UP TO 31 MPH. ALTHOUGH STATIONS REPORTED A GRADUAL DECREASE
IN RH VALUES AND THE GUANICA STATION REACHED THRESHOLD VALUES, IT
WAS BRIEF. GIVEN THE CURRENT CONDITIONS AND THE FORECAST, THE
RISK WILL REMAIN LOW FOR THE REST OF TODAY, THOUGH RESIDENTS AND
VISITORS ARE ENCOURAGED TO AVOID OUTDOOR BURNING, AS CRITICAL DRY
FUELS AND DROUGHT CONDITIONS CONTINUE AND COULD INCREASE THE
LIKELIHOOD OF WILDFIRE IGNITION AND RAPID SPREAD.
PRZ014-240800-
SOUTHEAST COASTAL PLAINS-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 0 30
TEMP (24H TREND) 76 (-2) 93 (+1) 76 93
RH % (24H TREND) 86 (+6) 48 (-5) 87 47
WIND 20FT/EARLY(MPH) E 14 E 16 E 13 E 14
WIND 20FT/LATE(MPH) E 11 E 16 NE 10 E 16
MIXING HGT(FT-AGL/MSL) 5760 5130
TRANSPORT WND (MPH) E 16 E 18
VENT RATE (KT-FT) 80640 82080
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-240800-
SOUTHERN HILLS-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 0 50
TEMP (24H TREND) 72 (-2) 91 (+3) 72 91
RH % (24H TREND) 97 (+9) 56 (-6) 97 58
WIND 20FT/EARLY(MPH) E 11 E 12 E 11 E 12
WIND 20FT/LATE(MPH) E 11 E 12 E 11 SE 12
MIXING HGT(FT-AGL/MSL) 6400 6140
TRANSPORT WND (MPH) E 15 SE 17
VENT RATE (KT-FT) 83200 92100
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-240800-
NORTH COASTAL PLAINS-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10 50
TEMP (24H TREND) 75 (-2) 93 (+1) 76 93
RH % (24H TREND) 96 (+6) 58 (-6) 97 60
WIND 20FT/EARLY(MPH) E 18 E 13 E 17 E 12
WIND 20FT/LATE(MPH) E 11 E 20 E 11 E 17
MIXING HGT(FT-AGL/MSL) 5670 5590
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 79380 72670
DISPERSION 5 5
DSI 6 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-240800-
NORTHERN HILLS-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS NONE TSTMS
CHANCE PRECIP (%) 10 40 0 50
TEMP (24H TREND) 73 (0) 91 (+1) 73 92
RH % (24H TREND) 98 (+4) 61 (-3) 98 63
WIND 20FT/EARLY(MPH) E 14 E 12 E 13 E 11
WIND 20FT/LATE(MPH) E 9 E 17 E 9 E 14
MIXING HGT(FT-AGL/MSL) 6580 6830
TRANSPORT WND (MPH) E 14 SE 13
VENT RATE (KT-FT) 78960 75130
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-240800-
WEST COAST-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS NONE TSTMS
CHANCE PRECIP (%) 10 50 0 70
TEMP (24H TREND) 74 (0) 94 (+1) 74 94
RH % (24H TREND) 98 (+3) 59 (-2) 98 60
WIND 20FT/EARLY(MPH) E 11 E 13 E 10 E 12
WIND 20FT/LATE(MPH) E 11 SE 13 E 11 E 14
MIXING HGT(FT-AGL/MSL) 4780 4690
TRANSPORT WND (MPH) E 13 E 10
VENT RATE (KT-FT) 52580 42210
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-240800-
EASTERN INTERIOR-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 10 50
TEMP (24H TREND) 74 (-2) 92 (+2) 74 92
RH % (24H TREND) 97 (+9) 57 (-5) 97 58
WIND 20FT/EARLY(MPH) E 12 E 13 E 11 E 12
WIND 20FT/LATE(MPH) E 12 E 13 E 11 E 13
MIXING HGT(FT-AGL/MSL) 7280 6620
TRANSPORT WND (MPH) E 16 SE 16
VENT RATE (KT-FT) 101920 92680
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-240800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 30 50
TEMP (24H TREND) 71 (-3) 87 (+4) 71 87
RH % (24H TREND) 100 (+9) 65 (-7) 100 65
WIND 20FT/EARLY(MPH) E 10 E 11 E 9 E 11
WIND 20FT/LATE(MPH) E 9 E 12 E 9 E 11
MIXING HGT(FT-AGL/MSL) 5230 4210
TRANSPORT WND (MPH) E 16 SE 17
VENT RATE (KT-FT) 73220 63150
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-240800-
CENTRAL MOUNTAIN RANGE-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR CLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS NONE TSTMS
CHANCE PRECIP (%) 10 50 0 70
TEMP (24H TREND) 70 (-1) 89 (+4) 70 89
RH % (24H TREND) 100 (+5) 63 (-5) 100 65
WIND 20FT/EARLY(MPH) E 8 E 9 E 8 E 10
WIND 20FT/LATE(MPH) E 8 E 10 E 8 E 10
MIXING HGT(FT-AGL/MSL) 7870 7640
TRANSPORT WND (MPH) E 10 SE 13
VENT RATE (KT-FT) 70830 84040
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-240800-
CAYEY MOUNTAIN RANGE-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 10 30
TEMP (24H TREND) 72 (-2) 87 (+2) 72 87
RH % (24H TREND) 99 (+6) 63 (-5) 99 65
WIND 20FT/EARLY(MPH) E 10 E 11 E 9 E 11
WIND 20FT/LATE(MPH) E 9 E 11 E 9 E 11
MIXING HGT(FT-AGL/MSL) 5990 5340
TRANSPORT WND (MPH) E 16 SE 17
VENT RATE (KT-FT) 83860 80100
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-240800-
VIEQUES-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 40 40
TEMP (24H TREND) 80 (-1) 91 (+1) 79 91
RH % (24H TREND) 85 (+7) 57 (-5) 86 57
WIND 20FT/EARLY(MPH) E 16 E 14 E 16 E 14
WIND 20FT/LATE(MPH) E 16 E 13 E 16 E 14
MIXING HGT(FT-AGL/MSL) 3390 2890
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 50850 46240
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-240800-
CULEBRA-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 40 40
TEMP (24H TREND) 79 (-3) 92 (+2) 79 92
RH % (24H TREND) 90 (+9) 59 (-8) 90 60
WIND 20FT/EARLY(MPH) E 17 E 14 E 16 E 14
WIND 20FT/LATE(MPH) E 17 E 13 E 16 E 14
MIXING HGT(FT-AGL/MSL) 3170 2830
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 50720 48110
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-240800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 20 0 20
TEMP (24H TREND) 76 (-1) 94 (+2) 75 94
RH % (24H TREND) 92 (+10) 49 (-5) 90 49
WIND 20FT/EARLY(MPH) E 16 E 18 E 14 E 18
WIND 20FT/LATE(MPH) E 16 SE 19 E 13 SE 19
MIXING HGT(FT-AGL/MSL) 4920 5200
TRANSPORT WND (MPH) E 21 E 20
VENT RATE (KT-FT) 88560 88400
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-240800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 40 40
TEMP (24H TREND) 79 (-2) 90 (+2) 78 90
RH % (24H TREND) 90 (+9) 60 (-7) 91 61
WIND 20FT/EARLY(MPH) E 17 E 14 E 16 E 16
WIND 20FT/LATE(MPH) E 17 E 14 E 16 E 14
MIXING HGT(FT-AGL/MSL) 3050 2810
TRANSPORT WND (MPH) E 20 SE 21
VENT RATE (KT-FT) 51850 50580
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-240800-
ST CROIX-
330 PM AST SUN AUG 23 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 30 40
TEMP (24H TREND) 79 (-2) 91 (+2) 78 91
RH % (24H TREND) 89 (+6) 63 (-5) 91 63
WIND 20FT/EARLY(MPH) E 16 E 14 E 14 E 14
WIND 20FT/LATE(MPH) E 16 E 14 E 14 E 16
MIXING HGT(FT-AGL/MSL) 4720 4640
TRANSPORT WND (MPH) E 18 SE 21
VENT RATE (KT-FT) 75520 83520
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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